diff --git a/README.md b/README.md
index a53ebc6..14ae49d 100755
--- a/README.md
+++ b/README.md
@@ -8,3 +8,14 @@ Telegram bot that monitor for a message containing a Twitter post link and reply
 1. `composer install`
 1. `php set_web_hook.php`
 1. It should work now
+
+## Design consideration
+
+### Zero Database
+As system maintainer, that is 1 less things to worry about.
+
+As a user, the usage data remain private as nothing is logged.
+
+Potential features that require Database includes
+- Bot usage analysis: just don't. Respect user's privacy.
+- Buttons: Each button can cotain upto 64 bytes in `callback_data`, hopefully this will be enough to store all context required for the functionality.
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